755557661 has 4 divisors (see below), whose sum is σ = 755632800. Its totient is φ = 755482524.

The previous prime is 755557547. The next prime is 755557679. The reversal of 755557661 is 166755557.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 755557661 - 2¹⁴ = 755541277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (755557681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19631 + ... + 43548.

It is an arithmetic number, because the mean of its divisors is an integer number (188908200).

Almost surely, 2^755557661 is an apocalyptic number.

It is an amenable number.

755557661 is a deficient number, since it is larger than the sum of its proper divisors (75139).

755557661 is a wasteful number, since it uses less digits than its factorization.

755557661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75138.

The product of its digits is 1102500, while the sum is 47.

The square root of 755557661 is about 27487.4091358207. The cubic root of 755557661 is about 910.7989847128.

The spelling of 755557661 in words is "seven hundred fifty-five million, five hundred fifty-seven thousand, six hundred sixty-one".